Method of casting metal bars



C. G. HELBY, J. BURKM, D. E. LINDQULST, E. W. ALLEN, F. L. RLGGIN AND B. LAU. METHOD of CASTING MELAL BARS. APPLICATION FIL-ED JAN'. I?, |918.

1,331,919. Patented Feb. 24, 1920.

` lforgings, both EZER W,v ALLEN,

ARD Lao,

. mTED sTATEs PATENT oEEioE.

CARL G. HEIBY, JOHN BURKAM, DAVID E. LINDQUIIST, EBENEZER W. ALLEN, FRED "L.

arenari-` AND RICHARD Lau, or sARNiA,

CANADA, ASSIGNORS, BY MESNE .ASSIGN'l MENTS, TO MUELLER METALS COMPANY, OFPORT HURQN, MICHIGAN, A CORPORA- TION OF MICHIGAN.

METHOD OF CASTING METAL BARS.

Patented Feb. 24, 1920.

,Application led January 17, 1918. Serial No. 212,223.

To all whom t may concern) y Be itknown that we, CARL G. HEIBY,

Jol-IN Bonitaii, .DAVID E. LINDQUIST,

FRED L. IticGiN, and RIGH- all `citizens ot the United States, except ALLEN, a subject of Great Britain, residing at `Sarnia, ton and `Dominion of Canada, have invented new and useful improvements in Methods of Casting Metal Bars, o'l which the following is a specification. The present invention relates to new and improved methods of an apparatus `for casting, more particularly the casting ot stock for use in drop forging.

Stock for forging must be tree from faults, such as blow holes, pipes, and dross fillings, for the reason that not only will suoli faults appear ,under the action of the press, but also where such Jforgings are at terward machined sub-surface faults may be developed. Such faults result in much stock that cannot be used, and many of the before `and after machining are so faulty as to be rejected, with the consequent loss of material and labor. therinore, faults not apparent after 'forging or machining may develop in use, necessitating the removal of the defective article and its replacement by a sound one.

This has been so serious a diiliculty that much of the stock is produced by the expensive inethod of rolling, .so as to eliminate the objectionable porosities which, as stated, are common in castings made under present methods.

iy practising the method and 'using the apparatus herein disclosed it is possible to produce stock free from the faultsiiamed, and equalto the rolled stock, expeditiously and cheaply,

large numbers and at a rela-` tively low cost, with practically no loss from rejected stock or hnished goods.

While the stock'm'oduced may, lol: course, be utilized for any purpose, the present einmanufacture of stock designed more par- 'ticularlyfor the rapid and economical production of fuse bodies for shells, which must, first, be of lhigh grade material to inand, second, must sure efficiency and safety,

expeditiously.

beproduced economically and i the drawings herewith is shown one EBEN- in the county of Lamb- 4 .,Fig. 1

Fur-

` so that finished articles may be turned out in physical embodiment of the apparatus and by which the method may be practised, and

in said drawings:

Figure 1 is a longitudinal sectionalview of molding apparatus made in accordance with this invention; i

Fig. 2 is a top plan view of the apparatus shown in Figl;

Fig.. 3 is a section transversely of the apparatus on substantially the linej3-3, of

looking in the direction of the arrow; and

Fig. 4 is a view similar to that shown in Fig. 3 with the mold or chill open.

Referring to the'drawings by numbers, like numbers indicatinglike parts vin the several views, 10 indicates the lower half of a mold lor chill, which is `channeled or grooved to the particular shape in cross section of the stock to be produced. The chill member 10 ismounted on any suitable support, as for example blocks 11, and may, if kdesired, be inclined, as shown, from its receiving end upwardly, such inclining of the chill, and consequent up hill run of the metal tending to give greater density to the resulting product.

Seated upon said chill ii'iember 10 and for convenience hinged thereto,

to coincide with the groove in the member 10, so that when the parts are closed a proper mold cavity is Jformed.

The two members 10 and 12 may be suit- I ably clamped together by U-clamps 13 and wedges 14, as shown, or by any usual and readily removable device. A

The memberl() is, preferably'extended as 'at 15 and-soinewhat thickened, a chamber 16- being formed in such extension, the bottom of which is below the bottom of the gr ove in the lower member 10, while the uppersurface of the vextension 15, which forms a seat for a spruce block 17 is in a plane be- The chamber 1(3"is preferably provided with a curved bottom which slopes easily to the bottom of the mold cavity in the chill.

The said sprue block lnembers are held tois a comple- -mentary upper chill member 12, grooved delivering to the chamber 16 ,heretofore devoting@ gether 'by any suitable means, as a screw clamp 18, and are clamped tightly to the seat formed by the extension 15 by a clamp 19 from the c 20,

a pool collected in an enlarged chamber at the receivin end of the chill cavity. Flow amber to the mold cavity is through the somewhat restricted passage formed by the lower end of the veitical sprue block, which lower end serves to dani and hold back 'dross and floating impurities and prevent their passing into the mold eavity. As the molten metal is poured into the.

sprue it will, of course, fall to the bottom of the'chill supplying chamber 'and the flow Will be from the 'bottom of the pool alon the slopin mol cavity, so t at pure metal only will be delivered. By maintaining an 'excess of -metal in the container so that the height of the poured metal in the chamber and sprue lcurved bottom surface, and

hole will be above the level of the passage leading to the chill cavity, all dross or other impurities are skimmed back and held in the vertical sprue hole so that their passage to the mold is impossible.

If desired the end of the stopped by a plug 21 which is placed at any desired point longitudinally of the mold cavity and will be securely held when the chill members are clamped together.

en the run has been made and the metal hasset and cooled and chill parts will be unclamped and separated and the'casting removed.` It will be of the form shown as filling and mold cavity in Fig. 1, with a body portion of pure dense metal free from faults, at the sprue end ofwhich will be the vertical portion formed by the sprue block. The relatively small vertical portion will contain those impurities which have been skimmed back and'prevented from entering the mold2 and maybe readily separated at chill may b e the`relat1vely thin sectionl by which it isl joined ytov f the main casting.

1. The 'method of casting which consists in pouring molten metal into a container having a relatively small orifice delivering to an enlarged receiving chamber with- `a assing the metal from said chamber into a cliill through rable chillt members,

closed molding cavity isv formed t0 which the metal is delivered from surface leading into the 2. A mold comprising chill members, one

of which has a chambered extension with a curved base surface, a sprue block mounted on such extension and in communication with said chamber, said sprue block member forming therewith a restricted said chan'iber tothe chill.

3. A mold comprising a plurality oi' sepaone of which has a chaiiibered extension with a curved licor surface, a sprue block formed of a plurality of passage froi'n,

members mounted on such extension and in communication with said chamber, said sprue block members forming therewith a restricted passage from said chamber to said chill.

4. The method ot' casting which consists in inclining the chill member upwardly from the receiving end thereof and maintaining a supply of molten metal lat the mouth of said inclined mold in excess of the receiving capacity ofsaid mouth.

A mold comprising a chill member hai'- ing a. chambered extension at one end thereoi, an independent sprue block mounted onsaid extension in communication with said chamber, and forming together therewith a restricted passage ti-om said chamber to said chill.

6. A mold comprising a pluralityotl separable chill members, one of which has a chambered extension, a'sprue block formed of a plurality of members mounted on said extension and in communication with said chamber, said sprue block forming there# with a restricted passage from said chamber to said mold.

7. vA mold comprising a plurality of horizontally separable chill members, the lower one of which has a chambered extension, a sprueblock formed of a. pluraiity of vertically separable members mounted on said extension and in communication with the chamber, said sprue block members forming therewith a restricted passage 'from said chamber to said mold.

8, A mold comprising a plurality of horizontally separable chill members, the lower one of which has a cjhambered extension, a

sprue block formed of a plurality lof verf its lower end extending below the mold bore ind the chill to form a restricted passage from the chamber to the said mold.

ULA mold comprising a plurality of horizontally separated chill members, the lower one of which has a chambered eX- tensionprovided with a seat on its upper surface, a sprue block formed of a plurality of vertically separable, loosely mounted members mounted on Seid seat and extending below the "t'oprof the mold bore, and a vchill to form a restricted passage from said A chambered extensmn to said mold, meansfor clamping, theloose sprue members t0- gether, and means for 4securing such clamped sprue bleek-to its seat'on the extension; f w

1l. In a moldua' plurality of chill members, means for clamping ysaid members lto-` gether, an extension on /one of said' chill members having .a chamber extending below the, bottom of the mold, a sprueblock formed of a plurality of Inenbers seated onsaid extensionA and forming. therewith aj restricted passage from said chamber to said moldmea ns for clamping said sprue block members together, and means'for clamping said members to the chill extension,

12. In a mold, a lower chill member, an

upper chill member` hinged thereto, an eX- a chamber extending below the bottom of the mold, means for clamping said hinged members together, a sprue block formed of a plurality ot' members mounted on said eX tension and forming' with said extension a restricted passage to Said mold. means for clamping said block members together, and

means for clamping said sprue block t0 its 'tension on the lower chill member having Y 

